// Copyright (c) 2008-2010, Arne Claus
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the 
// following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice, this list of conditions and the following 
//   disclaimer.
// - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following 
//   disclaimer in the documentation and/or other materials provided with the distribution.
// - Neither the name Arne Claus nor the names of any contributors may be used to endorse or promote products
//   derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef __INCLUDED_COGL_EXTENSIONS_H_
#define __INCLUDED_COGL_EXTENSIONS_H_

#include "CRL_Defines.h"
#include "CBL_Singleton.h"
#include <map>
#include <vector>

#define BUFFER_OFFSET(_Offset) ((void*)(_Offset))

CB_SUBNAMESPACE_START(OpenGL)

class CExtensions : public CSingleton<CExtensions>
{
public:
	
	CBL_SINGLETON_PRIVATE(CExtensions);
	
public:
	
	bool IsSupported(const char* _pExtensionName);
	
private:
	
	CExtensions();
	virtual ~CExtensions();
	
	CExtensions(const CExtensions&);				// forbidden
	CExtensions& operator = (const CExtensions&);	// forbidden
	
private:
	
	struct SStringChunk
	{
		const char*  m_pChunk;
		uint32 m_Length;
	};
	
private:
	
	typedef std::map<uint32, bool> CRegistryMap;
	typedef std::vector<SStringChunk> CStringVector;
	
	CRegistryMap  m_Registry;
	CStringVector m_ExtensionStrings;
};

CB_SUBNAMESPACE_END

#endif